/Engine/Plugins/Runtime/Metasound/Source/MetasoundGraphCore/Public/MetasoundVertex.h
FEnvironmentVertexInterface is aTVertexInterfaceGroupwhich holds FEnvironmentVertexes.
typedef [TVertexInterfaceGroup](API\Plugins\MetasoundGraphCore\TVertexInterfaceGroup)< [FEnvironmentVertex](API\Plugins\MetasoundGraphCore\FEnvironmentVertex) > FEnvironmentVertexInterface